Look at the lengths people here are trying to lose weight on their DH bikes. DH racers here are starting to act like little girls when they can save 50grams by changing their entire crankset (for example) and spend $250 just to do it.While were on the off-topic of crazy ideas, maybe one could add an air valve on the top tube,seat tube and down tube and fill it all with helium, then shave your balls, then take a crap. How well would that work
What you said may sound silly but it might be the next step.